NK may refer to: Businesses Imerys, a French mining multinational (Euronext ticker:NK) Nordiska Kompaniet, a Swedish department store Northrup-King Seed Company, U.S. Spirit Airlines, U.S. (IATA:NK) N
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f54928f0e7cd92139ebf59f7db1aae76ef0e863c1296dcc9d5ff0809994da6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/332441be-8e46-4f73-be69-6ea44dcd7a7c.json and https://artists.proofprofile.net/proofs/artist/332441be-8e46-4f73-be69-6ea44dcd7a7c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cbe274c252885282bad578302717c00c9cc8c3d1cc74891e1706f7789d71f6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X42127871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635ae67c23778b9804926ca7d453e40f2c94786824649789d4bfbfcef9b60e7b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X1964559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3863be1810cb5c08f58503aa437a63fbc83e73cac8b7b98276ecbe1ec93abf3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX282055412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f53b3a82187388e7b7861cfc3cec0738ad4cd7bafe2f22485d0987a567362e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X1840078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a791547c7d72ac2d4291a9a4c7303537760021fb7fe6cae91a5c026f751ce86. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1858059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f266336c9fd134cefe1de36b15527a8acafc7f6e920e69acc8b39c37e17be5d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X41815077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a0161bafe6e1b9bc87beec15769a8b6fb44a19937ecba98bab4659f76cedf3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR59R1880604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd89d8672f6c72605e5381d8c3fe3f117bfca0cf1ae201cefb278db90bdfe54. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X1840083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14eaeb15d5d747d151dc3f02dcbd8fffbe2bb442ef2272119d1de78a265845ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA0H2488166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebf4804c59f88dae89e1ff9e69e9e345af061f065154754fb1929d69e5bea22. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNJW2436732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956223fa7610d4d333019ba2b51a1ca7d0dfabb02862f07cac8c6d619e2034c4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMZ92462412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf994d6a83919acf7ec78b7b779344847632d541687cb03f7ad566e49515c71a4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ662433255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c2fb33c9ec765f4c446606a61b6de8e0472a80c9f1933c5f89cc12de33058f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA092328194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388a7c63e2b85783ed77a770babdd18fb1ff36cb78f193ce6338328f90b06e7e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X2381814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b6e2472724b79c9e2dd020f1e5f82ccfbc92607ad3878263959db21bd4fec0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA062236315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c338d7b6a9f41b705caad18e379f99570c45371c7995c6d0544672da6fc3937. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UABM12200593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c3d1ae5162483c18306074567c7b73f9f4b3364f6bdb93f1b99766d878c55f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR2X42243396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcc4d05d07546c166172ce6c9aaca020f49907c42e1cfbce8dd74d99209552e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX282281209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf33da9e68e6be7594aaa047c49b81759aca24e4b5b76e868b0993d09fd33990. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR59R2201437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f31ff0e9029b3bc4163fcce4809309debfa1f4ef9708a348e82d85d5ffa4c1f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX872121917.